Commitments and Contingencies (Details 2) (USD $) In Millions, unless otherwise specified	6 Months Ended
	Jun. 30, 2011
New Jersey Chrome Sites [Member]
Environmental Matters Paragraph Details [Abstract]
Study area 7 chromium residue	one million tons
Site Contingency Number Of Aco Sites	21
Third party past costs	$ 5
Publicly funded sites, fully responsible	24
Publicly funded sites, total	53
Partially responsible sites, percent	50.00%
Number of sites, partially responsible	10
Dundalk Marine Terminal [Member]
Environmental Matters Paragraph Details [Abstract]
Cost of developing and implementing permanent remedy percent	77.00%